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Im no expert here but CAI allows a greater volume of air to enter your engine (thus the modest hp increase). Greater "cold" airflow also drops the temperature in the engine block so along with better hp, you get faster throttle response, better fuel economy and greater engine life....plus it is an easy DIY mod (it won't void your warranty either as long as you get one that does not require a tune). It should be noted that the new Z-28 and Ford Shelby come with CAI.
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